164866639680 has 224 divisors, whose sum is σ = 582237982080. Its totient is φ = 43917189120.

The previous prime is 164866639519. The next prime is 164866639723. The reversal of 164866639680 is 86936668461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8431515 + ... + 8451045.

Almost surely, 2^164866639680 is an apocalyptic number.

164866639680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 164866639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291118991040).

164866639680 is an abundant number, since it is smaller than the sum of its proper divisors (417371342400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164866639680 is a wasteful number, since it uses less digits than its factorization.

164866639680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20534 (or 20518 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

It can be divided in two parts, 164866 and 639680, that added together give a triangular number (804546 = T₁₂₆₈).

The spelling of 164866639680 in words is "one hundred sixty-four billion, eight hundred sixty-six million, six hundred thirty-nine thousand, six hundred eighty".